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arXiv · 2210.15443

Properties of ZnO/ZnAl$_2$O$_4$ composite PEO coatings on zinc

M. Serdechnova·C. Blawert·S. Karpushenkov·L. Karpushenkava·T. Shulha·P. Karlova·R. Vasilic·S. Stojadinovic·S. Stojanovic·Lj. Damjanovic-Vasilic·V. Heitmann·S. M. Rabchynski·M. L. Zheludkevich
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Abstract

Recently the successful formation of PEO coatings on zinc in a phosphate aluminate electrolyte was shown. The produced composite coatings contain various mixtures of ZnO and ZnAl$_2$O$_4$. In frame of the current study, the properties of the formed coatings including adhesion/cohesion, wear, corrosion and photocatalytic activity were analysed to identify possible applications. However, the coatings show internal porosity and a sponge-like structure. Thus the cohesion within the coating is quite low. Pull-off tests have demonstrated clear rupture within the PEO layer at strength values as low as 1 MPa. The photocatalytic activity is limited, in spite of the formation of a higher amount of ZnO at shorter treatment times. Interestingly, the composite coatings of ZnO and higher amounts of ZnAl$_2$O$_4$ spinel showed a higher activity, but not sufficient for fast and effective catalytic cleaning applications.

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M. Serdechnova, C. Blawert, S. Karpushenkov, L. Karpushenkava, T. Shulha, P. Karlova, R. Vasilic, S. Stojadinovic, S. Stojanovic, Lj. Damjanovic-Vasilic, V. Heitmann, S. M. Rabchynski, M. L. Zheludkevich. 2022-10-27. Properties of ZnO/ZnAl$_2$O$_4$ composite PEO coatings on zinc. https://doi.org/10.1016/j.surfcoat.2021.126948

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